power to six units of the fukushima site. it is those six units that have received the majority of attention since that time. units one, too, and three were in operation at the time. units 4, 5, 6 were in a previously scheduled outages. immediately, after the tsunami, it appeared that there was no injection capability into the reactor vessels on units 1, 2, 3. on saturday, march 12, the hydrogen explosion occurred in a one, and the following monday, march 40, hydrogen explosion in unit 3 -- march 14. on the 15th of march, there were explosions in unit two and unit 4.